King's Guard desertion

What is the most common Kingsgaurd to turn against Joffrey?

Barristan "the Bold" Selmy is usually dismissed, but in fanfics sometimes you see him support Ned against Cersei.

Borros Blount and Meryn Trant are pretty much always loyal to Cersei and Joffrey, it's honestly kinda old.

Mandon Moore, this guy's a bit all over from what I've seen, but I will note he also has a pension for dying early in a lot of fics I've read.

Ary's Oakheart, I've seen this guy be pretty loyal to Robert or Ned against Cersei and Joffrey, and like Mandon it usually ends with him dead.

Preston Greenfield, one pretty memorable fic had him being friends with Brandon Stark and raising Brandon's bastard daughter and honestly it was a whole thing, a wild trip of a fic that I can't remember the name of.

Jaime Lannister, he really can't resist living up to his name, if he's still in Kingslanding when the Incest is revealed, he probably kills Robert.